a transmission-type tungsten disulfide (ws2) -based saturable absorber (sa) is fabricated and applied to passively q-switched nd: yvo4 laser. the ws2 nanosheets are deposited on a quartz substrate by the vertical evaporation method. by inserting the ws2 sa into the plano-concave laser cavity, we achieve 153-ns pulses with an average output power of 1.19w at 1064 nm. to the best of our knowledge, both of them are the best results among those obtained by the q-switched solid-state lasers with ws2-based absorbers. the repetition rate ranges from 1.176 mhz to 1.578 mhz. as far as we know, it is the first time that mhz level q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.